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when using telnet to a server and then do export DISPLAY to point to my PC which runs linux fedora 20 , it doesn't work
I used xhost+ in my Xserver
but, it seems to be something in the firewall.
It could be the firewall... but just as likely, the X server doesn't enable TCP connections. For security reasons, TCP connections are normally disabled.
It is easier (and more secure) to use ssh to make remote connections. ssh can forward X window connections properly without the problems caused by disabling security (xhost +) or trying to get the authorization keys transferred securely.
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